DE102013207345A1 - Method for operating a reciprocating pump - Google Patents
Method for operating a reciprocating pump Download PDFInfo
- Publication number
- DE102013207345A1 DE102013207345A1 DE201310207345 DE102013207345A DE102013207345A1 DE 102013207345 A1 DE102013207345 A1 DE 102013207345A1 DE 201310207345 DE201310207345 DE 201310207345 DE 102013207345 A DE102013207345 A DE 102013207345A DE 102013207345 A1 DE102013207345 A1 DE 102013207345A1
- Authority
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- Germany
- Prior art keywords
- coil
- time
- reciprocating
- pump
- msp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000004590 computer program Methods 0.000 claims description 6
- 239000003054 catalyst Substances 0.000 description 10
- 239000012528 membrane Substances 0.000 description 9
- 239000003638 chemical reducing agent Substances 0.000 description 8
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 3
- 239000004202 carbamide Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
- F04B43/04—Pumps having electric drive
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2203/00—Motor parameters
- F04B2203/04—Motor parameters of linear electric motors
- F04B2203/0401—Current
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Reciprocating Pumps (AREA)
Abstract
Die Erfindung betrifft ein Verfahren zum Betreiben einer Hubkolbenpumpe. Dieses umfasst das Ermitteln eines Spulenstroms einer Magnetspule der Hubkolbenpumpe, das Bestimmen des Zeitpunkts des mechanischen Stopps der Hubkolbenpumpe, und das Ändern eines Gradienten eines Anstiegs des Spulenstroms mittels einer pulsweitenmodulierten Ansteuerung.The invention relates to a method for operating a reciprocating pump. This includes determining a coil current of a solenoid coil of the reciprocating pump, determining the time of the mechanical stop of the reciprocating pump, and changing a gradient of an increase in the coil current by means of a pulse-width-modulated control.
Description
Die vorliegende Erfindung betrifft ein Verfahren zum Betreiben einer Hubkolbenpumpe, insbesondere einer Hubkolbenmembranpumpe im Dosiermodul eines SCR-Katalysatorsystems. Weiterhin betrifft die Erfindung ein Computerprogramm, das alle Schritte des erfindungsgemäßen Verfahrens ausführt, wenn es auf einem Rechengerät abläuft. Außerdem betrifft die Erfindung ein Computerprogrammprodukt mit Programmcode, der auf einem maschinenlesbaren Träger gespeichert ist zur Durchführung des Verfahrens, wenn das Programm auf einem Computer oder Steuergerät ausgeführt wird.The present invention relates to a method for operating a reciprocating piston pump, in particular a reciprocating diaphragm pump in the metering module of an SCR catalyst system. Furthermore, the invention relates to a computer program that performs all the steps of the inventive method when it runs on a computing device. Moreover, the invention relates to a computer program product with program code which is stored on a machine-readable carrier for carrying out the method when the program is executed on a computer or control unit.
Stand der TechnikState of the art
Beim SCR-Verfahren (Selective Catalytic Reduction) wird im Abgas einer Verbrennungskraftmaschine das Reduktionsmittel Ad blue® beigemischt, das zu einem Drittel aus Harnstoff und zu zwei Dritteln aus Wasser besteht. Eine Düse sprüht die Flüssigkeit unmittelbar vor dem SCR-Katalysator in den Abgasstrom. Dort entsteht aus dem Harnstoff das für die weitere Reaktion notwendige Ammoniak. Im zweiten Schritt verbinden sich im SCR-Katalysator die Stickoxide aus dem Abgas und das Ammoniak zu Wasser und ungiftigem Stickstoff. In the SCR process (Selective Catalytic Reduction), the reducing agent Ad blue® , which consists of one-third urea and two-thirds water, is mixed into the exhaust gas of an internal combustion engine. A nozzle sprays the liquid immediately before the SCR catalyst into the exhaust stream. There arises from the urea necessary for the further reaction ammonia. In the second step, the nitrogen oxides from the exhaust gas and the ammonia to water and non-toxic nitrogen combine in the SCR catalytic converter.
Der Hubmagnet
Die Hubkolbenmembranpumpe
Der Strom zum Zeitpunkt des MMP und des MSP muss aufgrund von Hardwareanforderungen des Steuergeräts
Offenbarung der ErfindungDisclosure of the invention
Das erfindungsgemäße Verfahren zum Betreiben einer Hubkolbenpumpe, insbesondere einer Hubkolbenmembranpumpe, umfasst das Ermitteln eines Spulenstroms einer Magnetspule der Hubkolbenpumpe, das Bestimmen des Zeitpunkts des mechanischen Stopps der Hubkolbenpumpe, und das Ändern eines Gradienten eines Anstiegs des Spulenstroms mittels einer pulsweitenmodulierten Ansteuerung (PWM). Ein großes PWM resultiert in einer hohen Effektivspannung und einem steilen Anstieg des Spulenstroms. Ein kleines PWM resultiert in einer kleinen Effektivspannung und einem flachen Anstieg des Spulenstroms. Das erfindungsgemäße Verfahren reduziert Umladeverluste in der Magnetspule, so dass deren Verlustleistung sinkt. Außerdem wird die magnetische Sättigung der Magnetspule unterbunden und durch einen langsameren Kolbenhub der Hubkolbenpumpe werden deren Geräuschemissionen reduziert.The method according to the invention for operating a reciprocating pump, in particular a reciprocating diaphragm pump, comprises determining a coil current of a solenoid of the reciprocating pump, determining the time of the mechanical stop of the reciprocating pump, and changing a gradient of an increase of the coil current by means of a pulse width modulated control (PWM). A large PWM results in a high RMS voltage and a steep increase in coil current. A small PWM results in a small rms voltage and a shallow rise of the coil current. The inventive method reduces Umladeverluste in the solenoid, so that their power dissipation decreases. In addition, the magnetic saturation of the solenoid is suppressed and a slower piston stroke of the reciprocating pump whose noise emissions are reduced.
Insbesondere wird durch ein variables Tastverhältnis T eine konstante Effektivspannung Ueff an der Magnetspule eingestellt. Das Tastverhältnis T entspricht vorzugsweise gemäß Formel 1 dem Quotienten aus konstanter Effektivspannung Ueff und einer Bordnetzspannung UNetz, wobei die Hubkolbenpumpe elektrisch mit einem Bordnetz verbunden ist:
Ein Sollzeitpunkt tMSP_Soll des mechanischen Stopps der Hubkolbenpumpe kann insbesondere mittels eines Regelkreises eingestellt werden. Dieser ermöglicht einen definierten Betrieb der Hubkolbenpumpe über deren Lebenszeit.A target time t MSP _Soll of the mechanical stop of the reciprocating pump can be adjusted in particular by means of a control loop. This allows a defined operation of the reciprocating pump over its lifetime.
Es ist bevorzugt, dass der Zeitpunkt tMSP des mechanischen Stopps der Hubkolbenpumpe mittels eines lokalen Minimums im Verlauf des Spulenstroms ISpule bestimmt wird. Weiterhin ist es bevorzugt, dass bei der Bestimmung des Zeitpunkts tMSP des mechanischen Stopps der Hubkolbenpumpe ein Zeitpunkt tMMP berücksichtigt wird, zu dem sich ein Magnetanker der Hubkolbenpumpe in Bewegung setzt. Dabei wird dieser Zeitpunkt tMMP mittels eines lokalen Maximums im Verlauf des Spulenstroms ISpule bestimmt.It is preferred that the time t MSP of the mechanical stop of the reciprocating pump is determined by means of a local minimum in the course of the coil current I coil . Furthermore, it is preferred that in the determination of the time t MSP of the mechanical stop of the reciprocating pump, a time t MMP is considered, to which a magnet armature of the reciprocating pump is set in motion. In this case, this time t MMP is determined by means of a local maximum in the course of the coil current I coil .
Das erfindungsgemäße Verfahren ermöglicht es insbesondere, dass der Spulenstrom ISpule zum Zeitpunkt tMSP des mechanischen Stopps der Hubkolbenpumpe und zu einem Zeitpunkt tMMP, zu dem sich ein Magnetanker der Hubkolbenpumpe in Bewegung setzt, auf einen Maximalwert Imax begrenzt wird, der mindestens 2,5 A, bevorzugt mindestens 3,0 A beträgt. Dadurch ermöglicht das erfindungsgemäße Verfahren die Verwendung einer härteren Membran in der Hubkolbenpumpe, als diese bei einem herkömmlichen Verfahren zum Betrieb der Hubkolbenpumpe möglich wäre. Dies resultiert in einer genaueren Modellierbarkeit des Systemdrucks eines Dosiermoduls eines SCR-Katalysatorsystems, in dem die Hubkolbenpumpe verbaut ist.The method according to the invention makes it possible, in particular, for the coil current I coil to be limited to a maximum value I max at the time t MSP of the mechanical stop of the reciprocating pump and at a point in time t MMP at which a magnet armature of the reciprocating pump starts to move , 5 A, preferably at least 3.0 A. Thus, the inventive method allows the use of a harder membrane in the reciprocating pump, as this would be possible in a conventional method for operating the reciprocating pump. This results in a more accurate modeling of the system pressure of a dosing of a SCR catalyst system in which the reciprocating pump is installed.
Das erfindungsgemäße Verfahren kann von einem Computerprogramm ausgeführt werden, wenn dieses auf einem Rechengerät des Steuergeräts abläuft. The method according to the invention can be executed by a computer program when it runs on a computing device of the control unit.
Dies ermöglicht es beispielsweise das Verfahren in das Steuergerät eines Kraftfahrzeugs zu implementieren, ohne daran bauliche Veränderungen vornehmen zu müssen. Erfindungsgemäß ist außerdem ein Computerprogrammprodukt mit Programmcode vorgesehen, das auf einem maschinenlesbaren Träger gespeichert ist, zur Durchführung dieses Verfahrens, wenn das Programm auf einem Rechengerät des Steuergeräts ausgeführt wird.This makes it possible, for example, to implement the method in the control unit of a motor vehicle without having to make any structural changes. According to the invention, a computer program product with program code is also provided which is stored on a machine-readable carrier for carrying out this method when the program is executed on a computing device of the control device.
Kurze Beschreibung der ZeichnungShort description of the drawing
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung darstellt und in der nachfolgenden Beschreibung näher erläutert.An embodiment of the invention is illustrated in the drawing and explained in more detail in the following description.
Ausführungsformen der ErfindungEmbodiments of the invention
Die Bewegung ist bei einer Ansteuerung der Hubkolbenmembranpumpe
Zur Bestimmung des Systemdruckes p wird ein Isobarenkennfeld genutzt, wie es in
Wenn der Zeitpunkt tMSP durch das erfindungsgemäße Verfahren auf einen Sollwert tMSP_Soll eingestellt wird, kann das Isobarenmodell auf den in
Hierzu wird, wie es in
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013207345.3A DE102013207345B4 (en) | 2013-04-23 | 2013-04-23 | Method for operating a reciprocating piston pump |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013207345.3A DE102013207345B4 (en) | 2013-04-23 | 2013-04-23 | Method for operating a reciprocating piston pump |
Publications (2)
Publication Number | Publication Date |
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DE102013207345A1 true DE102013207345A1 (en) | 2014-10-23 |
DE102013207345B4 DE102013207345B4 (en) | 2021-04-29 |
Family
ID=51628974
Family Applications (1)
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DE102013207345.3A Expired - Fee Related DE102013207345B4 (en) | 2013-04-23 | 2013-04-23 | Method for operating a reciprocating piston pump |
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DE (1) | DE102013207345B4 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107842488A (en) * | 2016-09-19 | 2018-03-27 | 罗伯特·博世有限公司 | The method for running the stroke magnet armature pump for returning to conveying in empty stage |
DE102016219685A1 (en) | 2016-10-11 | 2018-04-12 | Robert Bosch Gmbh | Method and device for operating a return pump |
EP3460241B1 (en) | 2017-09-26 | 2022-03-16 | Albonair GmbH | Method for monitoring a magnetic piston pump |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013211274B4 (en) | 2013-06-17 | 2024-05-02 | Robert Bosch Gmbh | Method for determining the system pressure in the delivery module of an SCR catalyst system |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10127996A1 (en) * | 2001-06-08 | 2002-12-12 | Thomas Magnete Gmbh | Pump arrangement has electromagnet with control current whose amplitude is measured over period of time and its time variation derived and used as input signal to voltage switch |
DE102005024858A1 (en) * | 2005-05-31 | 2006-12-07 | J. Eberspächer GmbH & Co. KG | Method for operating a metering pump, in particular for conveying fuel for a vehicle heater |
DE102007061478A1 (en) * | 2007-12-20 | 2009-06-25 | J. Eberspächer GmbH & Co. KG | A method of analyzing the operation of a liquid metering pump, in particular a fuel metering pump for a vehicle heater |
DE102010030860A1 (en) * | 2010-07-02 | 2012-01-05 | Robert Bosch Gmbh | Method for operating reducing agent dosing system for selective catalytic reduction catalyst-converter in exhaust line of combustion engine of motor car, involves actuating metering valve for dosing certain dosage amount into exhaust line |
-
2013
- 2013-04-23 DE DE102013207345.3A patent/DE102013207345B4/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107842488A (en) * | 2016-09-19 | 2018-03-27 | 罗伯特·博世有限公司 | The method for running the stroke magnet armature pump for returning to conveying in empty stage |
DE102016219685A1 (en) | 2016-10-11 | 2018-04-12 | Robert Bosch Gmbh | Method and device for operating a return pump |
EP3460241B1 (en) | 2017-09-26 | 2022-03-16 | Albonair GmbH | Method for monitoring a magnetic piston pump |
Also Published As
Publication number | Publication date |
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DE102013207345B4 (en) | 2021-04-29 |
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